I have been told several conflicting things about standby. My amp has a 3-way power switch - standby/off/on. I have been told to switch the amp on in standby for 30 seconds to a minute, then to on. If I need to take a quick break, I put it into standby. But I have also been told that the amp should be turned on for 30 seconds, then put into standby for another minute or two, then set to on. I have also read (I think it was Billfitzmaurice) that standby is useless for startup, and doesn't extend tube life. What say ye?